- Joined
- Jan 27, 2018
- Messages
- 39
I have this no name (imported?) chuck for a while. I came with the lathe, and seems to be in pretty good quality but it was painful to use it as the taper end was cut short by the previous owner and I would not eject when tailstock was fully retracted.
One way to address the issue is obviously replace the MT2 taper, but I don’t have the wedges to loosen the Jacob taper on the chuck end. Plus, I owner a good 1/2” Jacob chuck, don’t feel like spend too much on a Jacob taper for this import chuck.
So here is my hack to get the ejection to work. The idea, might have from one of the post here, is to add a short round stock which extended the taper long enough so it will catch the center pin and push itself out. But I don’t really want to deal with “fishing” the round stock with magnet when switching to other inserts. So I decide to drill and tap a 1/4-20 hole and I then screw in a 3/4 length bolt...
Here a few pictures of the process, and the final “product”. The bolt is put on with lock-tite, in case I need a shorter taper for whatever reason. I can just remove the bolt.
I could not find a good way to clamp the taper with chuck attached. So I ended clamped a 3/8 mandrill in the collet and lock the drill church on the mandrill. It was not perfect, there was a lot runout introduced by the chuck. But I think it might just be the chuck itself. Fortunately I just need need it for bolt the precision isn’t too critical.
Started off with a center drill.
A few interactions of increasing the drill size, finally ended with 7/32 drill bit.
Tap into 1/4-20 starting with the starter tap in the tail stock, and then complete with the tapping wrench.
One way to address the issue is obviously replace the MT2 taper, but I don’t have the wedges to loosen the Jacob taper on the chuck end. Plus, I owner a good 1/2” Jacob chuck, don’t feel like spend too much on a Jacob taper for this import chuck.
So here is my hack to get the ejection to work. The idea, might have from one of the post here, is to add a short round stock which extended the taper long enough so it will catch the center pin and push itself out. But I don’t really want to deal with “fishing” the round stock with magnet when switching to other inserts. So I decide to drill and tap a 1/4-20 hole and I then screw in a 3/4 length bolt...
Here a few pictures of the process, and the final “product”. The bolt is put on with lock-tite, in case I need a shorter taper for whatever reason. I can just remove the bolt.
I could not find a good way to clamp the taper with chuck attached. So I ended clamped a 3/8 mandrill in the collet and lock the drill church on the mandrill. It was not perfect, there was a lot runout introduced by the chuck. But I think it might just be the chuck itself. Fortunately I just need need it for bolt the precision isn’t too critical.
Started off with a center drill.
A few interactions of increasing the drill size, finally ended with 7/32 drill bit.
Tap into 1/4-20 starting with the starter tap in the tail stock, and then complete with the tapping wrench.
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